Paste a receipt (a sample is loaded) and press Verify. Nothing is uploaded — the content hash and chain are recomputed here, in your browser, against draft-smith-corobate-attestation-receipt-00. This is the "re-run it yourself, trusting no one" step. Try the Tamper button: change one character and watch it break.
openssl ts -verify -data head.bin -in head.tsr -CAfile ca.crt. The hosted verifier at
verify.corobate.com performs this server-side. This page confirms content reproduction, the hash chain,
the confidence gate, the point-in-time horizon, and that the anchor covers the head.